If you’ve got a lust for space travel, a desire to go where only a couple of dozen people have gone before, and $150 million to spare, Space Adventures needs you. The space tourism company--it’s the one that organizes the ISS trips via the Russian Soyuz--has mapped a potential tour around the moon that could lift off within five years. But until it sells the second seat, the mission will remain grounded.

That’s right, the second seat. The company has already secured a nine-digit commitment from one customer for a potential lunar sightseeing tour. And the logistics are already in place as well: aboard a three-seat Russian Soyuz spacecraft (the third seat is for a Russian mission commander), the tourists would launch into orbit where they would rendezvous with a separately-launched unmanned rocket, which would jet them the rest of the way to the moon.